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I'm having a series of problem with my macOS Sierra 10.12.1 every once in a while after a random period of normal operation. The series of problems include:

  • My 3rd-party Chinese input methods (Sogou & Rime) both start double-typing on every letter. English isn't affected, but cycling through the keyboards do not help with the problem.
  • Launchpad starts taking double keystroke and double touchpad swipes on arrow keys, basically skipping any odd-numbered pages
  • Any keystrokes plus the return key would launch an app whose name starts with those keystrokes (which is a Spotlight behavior) regardless of whether Spotlight is on. This problem is somewhat intermittent.
  • There are no apparent log traces (that I'm aware of) in the console.
  • All above problems begin together, and persist until restart.

I have cleared any keyboard-related config files in /Library and ~/Library, as well as purged all apps with access to accessibility function, but nothing would work. The problem has been observed on both the MacBook Pro 13" (2011) and MacBook Pro 15" 2016, with Touch Bar, which migrated the system from the former.

Anybody could give me a clue what could be happening?

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  • Any problem with Chinese ims provided by Apple? Dec 5, 2016 at 4:56
  • Any antivirus junk like webroot installed? Jan 7, 2017 at 18:44

3 Answers 3

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A friend of mine, who works at an Apple Premium Reseller, told me that:

  1. It's a known problem that has to do with MacOS Sierra;
  2. Results in all different sorts of weird behaviour until reboot;
  3. Only happens on factory installed Macs (running MacOS Sierra);
  4. Is not harmful for your computer (hardware); and,
  5. Advised to wait for a software update from Apple.
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  • In my case at some point Spotlight won't accept any keyboard input anymore until reboot.
    – user218845
    Jan 7, 2017 at 18:26
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I've had the same issue for years, at least since 10.11. Surprisingly, a simple "killall Dock" fixed it (temporarily) for me.

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I have come up a solution to this double keystroke problem using a tiny piece of double sided tape to help the key cap stick to the key switch.

Watch my video to see the process: https://www.youtube.com/watch?v=LhUdXhoDWDk

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  • While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes.
    – grg
    Mar 17, 2018 at 8:26

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